b'Design Example 1Heavy Weight New ConstructionCohesionless SoilStructural Details: New Building2 story house with basement ULT. CAP = 60,000 lb Estimated weight 3,700 lb/ft WORKING LOAD = Working load on foundation piles30,000 lb 30,000 lbTAB-288- Top of pile to be 12 above the soil surface NC 3/4 8x8 Soil data: PILE CAP6 feet of sandy clay fill (CL), stiffDensity = 110 pcf30 feet of medium grained, well graded sand(SW), medium dense, SPT N = 22 TAEW-288-84Density = 120 pcf= 32 0 EXTENSIONWater table = 14 ft SANDY CLAYRecommended target depth = 18 ft. DEPTH = 6\'DENSITY =Torque Anchor Design: 110 pcf1.Selectthepropercapacityequationandcollect the known information.The target soilonthesiteiscohesionlesssoEquation 1b from Chapter 1 is used:P u = A H(q N q ) Where: TAEW-288-84 DEPTH TOEXTENSION MIDWAYP w= 30,000 lb BETWEENFS = Factor of Safety = 2.0 PLATESP u= P wx FS = 30,000 lb x 2.0 = 60,000 lb. WATER= 18\'h mid= 18 ft. TABLE = 14\'(Use the designers target depth of 18 ft.Thisis the measurement from the surface tomidway between the helical plates.) TAF-288-84 8-10-12LEAD SECTION MINIMUMq= 1,852 lb/ft 2 PRODUCT= (110 lb/ft 3x 6 ft) + (120 lb/ft 3 x 8 ft) + (120 LENGTH 62) lb/ft 3 x 4 ft) = 1,852 lb/ft 2 L = 21 1/2\'N q= 24 (Use N = 22 - Chapter 1 - Table7)RearrangeEquation1btosolveforthe HOMOGENOUSrequired helical plate area. SANDDEPTH = 30\'A H= P u/ (q N q ) DENSITY = 120 pcf LENGTH FROM MID-2PLATE DEPTH TOA H= 60,000 lb / 1,852 lb/ftx 24 DEG. TIP OF PILE2 S = 3 x (8" + 10") / 2A H= 1.35 ft S = 27"2.SelecttheECPHelicalTorqueAnchor suitable to support the load.ReferringtoChapter1,Table2the2-7/8diameterx0.276wallthicknessstandard Figure 1.Design Example 1 & 2tubularpileshaftisselectedasmosteconomicalforthisapplication.Our project Referring to Chapter 1, Table 10 (shown below)requires ultimate capacity of 60,000 pounds of a combination of helical plates is selected fromcompressivestrength.Theselectedpileshaft the row opposite 2-7/8 dia shaft.At least 1.35hasa CompressiveLoadLimitof100,000 ft 2 ofbearingareaisneededtosupportanpoundsanda UseableTorsionalStrengthof ultimate capacity of 60,000 pounds. From Table9,000ft-lbs.ReviewingtheProductCapacities 10inChapter1(Seebelow),selecttheTable 2 on Chapter 1Page 5, one can see that combination of helical plates to mount on the 2-the 2-7/8 x 0.276 shaft size is a good fit. 7/8 diameter tubular shaft.ECP Technical Design ManualTorque Anchor Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 5Page 79 All rights reserved'